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2 Friction Gears (wheels)Wheels that do NOT have teeth.Wheels move because of friction between them.Transmit rotational motion between two or more parts that are close together.Rotational direction reverses in side-to-side contact.Easier to assemble and cost less to make.Disadvantage: Gears tend to slip.

3 Friction Gears (wheels)The larger diameter of the gear the slower it rotates.Made of high friction materials like rubber.Can be positioned along parallel, perpendicular, or other rotational axis depending on need.

4 Belt & Pulley At least two wheels are connected together by a belt.Wheels are toothless and therefore called pulleys.Used to transmit rotational motion between parts that are further apart.When more than two pulleys are used, only the pulley that touches the same side of the belt will turn in the same direction.Can reverse motion.

5 Belt & PulleyThe often contains a groove allowing the belt to function smoothly and securely.The belt must stick or adhere to the pulley to avoid slipping.The larger the pulley the slower it turns.

6 Gear AssemblyAt least two gears that meet and fit perfectly into one another.Slippage between gears is prevented by interlocking gear teeth.Used to transmit motion between parts that are close together.Can reverse motion.

7 Gear AssemblyFor the two or more gears to work together, the teeth of each gear need to be the same size, shape, direction (straight or helical) and must be equally spaced.The positioning of the gears can vary: Parallel (Straight gears are used) or Perpendicular (Bevel gears).The more teeth on a gear, the slower the rotation speed and vice versa.The smaller the diameter of the gear, the faster the rotation and vice versa.

9 Chain and Sprocket WheelsThe teeth on the Sprocket Wheels must be identical as ONE chain must fit on all sprockets in the system.The links in the chain are designed to fit securely on the teeth of the sprockets.This system requires lubrication such as grease or oil on a regular basis to avoid wear.The larger the sprocket the slower it turns and vice versa.

11 Wheel & Worm GearMade from a single worm (screw) that rotates. This motion is transmitted to one or more wheel gears.The worm can turn continuously.Movement is very slow, however.Motion CANNOT be reversed.

12 Wheel & Worm GearThe groove on the worm (screw component) must fit the wheel teeth so that they fit together and motion is possible.The drive component is always the worm gear and this is what makes this system non-reversible.